Visible light communication (VLC) system provides an opportunity for data transmission and its traditional use as source of illumination. Besides, dimming control is also required to achieve variable levels in some sp...
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ISBN:
(纸本)9781538636282
Visible light communication (VLC) system provides an opportunity for data transmission and its traditional use as source of illumination. Besides, dimming control is also required to achieve variable levels in some specific circumstances. Among the various modulation schemes to achieve dimming control, multiple pulse-position-modulation (MPPM) is regarded as a more spectral-efficient and energy-saving method. In this paper, we proposed the fast detection algorithm for MPPM based on maximum likelihood (ML) principle, which is suitable for fast dimmable indoor VLC system. Thus, the information about transmitted data and dimming factor can be acquired instantly. Finally, error performances are provided with difference dimming levels via MATLAB simulation.
Aiming at fast hardware processing, a detectionalgorithm for multiple-input multiple-output (MIMO) systems that employ spatial modulation (SM), or SM-MIMO, is proposed. Conventional SM-MIMO detection inherently suffe...
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Aiming at fast hardware processing, a detectionalgorithm for multiple-input multiple-output (MIMO) systems that employ spatial modulation (SM), or SM-MIMO, is proposed. Conventional SM-MIMO detection inherently suffers from the nearsightedness as it depends only on the cost of the preceding path that has been traversed. To overcome such a drawback, the proposed detection traverses the tree by taking into account not only the cost of the preceding path but also the estimated cost of the sub-tree that has not been visited yet. Compared to conventional methods, as a result, the proposed algorithm significantly reduces the number of visits that determines the latency in hardware, making it suitable to hardware implementation.
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